Duplicate In Your Cart - Serial Number Is

Lena checked her purchase history. She had never bought this monitor before. She checked the seller’s stock: “2 available.” She even checked the photos—two different boxes, two different cosmetic condition notes.

“Ma’am, I’m showing that serial number was last scanned… inside an apartment building three blocks from your current address. Six hours ago. While you were sleeping.”

The agent put her on hold. When he returned, his voice was quieter.

They matched. .

“Last known?” Lena asked.

Same number.

She checked her invoice from two years ago. .

This time, she added them one by one. The first unit—serial ending —went in fine. The second—serial ending L907 —triggered the warning again.

She called support.

But the red text appeared beneath the second item: Serial number is duplicate in your cart. She frowned. That was impossible. She had added two separate listings. She refreshed the page. The error remained. So she removed both, cleared her cache, and started over.